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Finding the Fourth Proportional to 8,688.98, 12,921.70 and 8,412.19

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Solution

The fourth proportional to 8,688.98, 12,921.70 and 8,412.19 is: 12,510.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.98 : 12,921.70 = 8,412.19 : x
  2. Step 2: Convert to fraction form
    8,688.98/12,921.70 = 8,412.19/x
  3. Step 3: Cross multiply
    8,688.98x = 12,921.70 × 8,412.19
  4. Step 4: Simplify right side
    8,688.98x = 108,699,790.64
  5. Step 5: Solve for x
    x = 108,699,790.64/8,688.98
  6. Step 6: Final answer
    x = 12,510.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.